Tarek ElBaz, MD. Prof. Internal Medicine Chief, Division of Renal Medicine Al Azhar University President, ESNT
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1 The Kidney in Multiple Myeloma Tarek ElBaz, MD. Prof. Internal Medicine Chief, Division of Renal Medicine Al Azhar University President, ESNT
2 Normal Cell Plasma cells produce antibodies that bind to antigens, fighting infection and at times causing disease Plasma cells produce antibodies that bind to antigens, fighting infection and at times causing disease.
3 Antibodies
4 Myeloma Cells In multiple myeloma, a malignant transformation occurs producing myeloma cell. These cells produce antibodies in excess.
5 Multiple Myeloma Definition: Malignant proliferation of plasma cells derived from a single clone MM is a plasma cell dyscrasia that accounts for almost 10% of all hematologic malignancies Etiology: radiation; mutations in oncogenes; familial causes; role of IL 6 Incidence increases with age Males> females ; Blacks > Whites Kyle et al. Cancer 101 : , 2004 Korbet & Shawartz. JASN September 2006 vol.
6 Clinical Manifestations Bone Pain: 70%, precipitated by movement Pathological fractures Activation of osteoclasts by OAF produced by myeloma cells Susceptibility to infections: Diffuse hypogammaglob. If the M spike is excluded Poor antibody responses, neutrophil dysfunction Pneumococcus, S. aureus: Pneumonia, pyelonephrits Rajkumar. Et al., Mayo Clin Proc 80 : , 2005
7 Clinical Manifestations Common Bone pain and pathological fractures Anemia and bone marrow failure Infection due to immune-paresis and neutropenia Renal impairment Less common Acute hypercalcemia Symptomatic hyperviscosity Neuropathy Amyloidosis Coagulopathy
8 Clinical Manifestations Renal failure: 25% Multiple contributory factors Hypercalcemia, hyperuricemia, recurrent infections Tubular damage produced by Light chains type 2 proximal RTA, non selective proteinuria Anemia: 80% Normochromic/normocytic Myelophthisis: inhibition by cytokines produced by plasma cells. Leukopenia/thrombocytopenia only in advanced cases.
9 Bone Disease 70% cellularity, increased atypical plasma cells comprising 60% of cellularity.
10
11
12 Skull infiltrations
13 Minimal diagnostic criteria for myeloma >10% Plasma cells in bone marrow or plasmacytoma on biopsy Clinical features of myeloma Plus at least one of: Serum M band (IgG >30 g/l; IgA >20 g/l) Urine M band (Bence Jones proteinuria) Osteolytic lesions on skeletal survey
14
15
16 Epidemiology Serum creatinine > mg/dl The one-year survival is 80% in pts. with Cr < 1.5 compared to 50% in pts. with a Cr > 2.3 Prognosis is especially poor in pts. who require dialysis
17 Causes of renal failure in MM Cast nephropathy Light chain deposition disease Primary amyloidosis Hypercalcemia Renal tubular dysfunction Volume depletion IV contrast dye, nephrotoxic medications
18 Start et al., Am J Physiol. 1998;275:F246-F254.
19 Myeloma Kidney Two main pathogenetic mechanisms: Intracellular cast formation Direct tubular toxicity by light chains Contributing factors to presence of renal failure due to multiple myeloma: High rate of light chain excretion (tumor load) Biochemical characteristics of light chain Concurrent volume depletion
20 Most common pathological diagnosis on renal biopsy in multiple myeloma Cast Nephropathy Multinucleated giant cells surround the casts Due to light chains binding with Tamm-Horsfall mucoprotein, which is secreted by tubular cells in ascending loop of Henle, forming casts Dehydration worsens cast nephropathy due to decreased flow in tubules, increased concentration of light chains
21 Cast Nephropathy
22 Cast Nephropathy
23 Light Chain Deposition Disease LCDD Most commonly presents with both renal insufficiency and nephrotic syndrome Usually due to kappa (κ) immunoglobulin fragments which deposit in kidneys Circulating light chains are taken up and partially metabolized by macrophages, and then secreted and precipitate, causing tubular injury and thus, proteinuria Korbet and Schwartz. JASN September 2006 vol. 17 no
24 Uptake of light chains by proximal tubular cells. Renal biopsy specimen from a patient excreting κ light chains. Immunoperoxidase staining showing κ light chains along the brush border and in the cytoplasm of the PTC (brown stain). Batuman et., Am J Physiol. 1998;275:F246-F254.
25 The tubular basement membranes stained with κ Ig light chain (A) show bright (3+) Monoclonal Ig deposition disease (MIDD) with diffuse and nodular glomerulosclerosis. Courtesy of Jean L. Olson, University of California San Francisco
26 AL-amyloidosis AL-amyloidosis is found in up to 30% of patients who present with multiple myeloma; conversely, multiple myeloma is present in up to 20% of patients who present with AL-amyloidosis. Proteinuria is the most common renal manifestation at presentation, occurring in up to 80% of patients with the nephrotic syndrome seen in 30 to 50% of these patients. Posi et al. Clin Nephrol 43 : , 1995
27 Amyloidosis Usually due to lambda (λ) light chains (AL) Pathogenesis is similar to LCDD, in that light chains are taken up and partially metabolized by macrophages and then secreted then precipitate to form fibrils that are Congo red positive, b-pleated Like LCDD, due to tubular injury and also presents as nephrotic syndrome Kyle. Adv Nephrol Necker Hosp 28 : , 1998
28 Renal amyloidosis, ultrastructural appearance. Amyloid deposits are seen as randomly arranged, 10-nM fibrils of indefinite length Glomerulus stained with Congo red
29 Hypercalcemia Hypercalcemia occurs in multiple myeloma due to bone resorption from lytic lesions Serum calcium > 11.0 mg/dl occurs in 15% of pts with multiple myeloma Hypercalcemia commonly contributes to renal failure by renal vasoconstriction, leading to intratubular calcium deposition
30 Renal Tubular Dysfunction Acquired Fanconi syndrome On occasion, light chains cause tubular dysfunction without renal insufficiency Most commonly occurs with kappa light chains Light chains are resistant to protease degradation and have tendency to accumulate in tubule epithelial cells and form crystals
31 Renal Tubular Dysfunction Acquired Fanconi syndrome Renal affection in MM Tubular damage due to light chain toxic effects or indirectly from Two main the release pathogenetic of intracellular lysosomal enzymes mechanisms: Intracellular cast formation This presents as Fanconi syndrome proximal renal tubular Direct acidosis tubular with toxicity wasting by of potassium, phosphate, uric light acid, chains and bicarbonate
32 Role of IL-6 IL-6 is an important growth factor for plasma cells in multiple myeloma, and may play a role in myeloma kidney IL-6 stimulates acute phase reactants from liver, promoting cast formation and possibly impairing light chain resorption IL-6 also contributes to hypercalcemia by stimulating osteoclasts
33 Treatment of renal failure in MM Hydration with IV fluids Treatment of hypercalcemia Loop diuretics Caution with bisphosphonates Treatment of myeloma Pulse steroids +/- thalidomide VAD chemotherapy ASCT Possible role for plasmapheresis Dialysis, as necessary
34 Plasmapheresis in MM Theoretical benefit in removing the toxic circulating light chains to spare renal function Limited data to support efficacy Treatment of choice if hyperviscosity symptoms are present Potential risk for bleeding if Dx is needed due to pheresis-induced removal of coagulation factors
35 Plasmapheresis in MM
36 FLCs and cast nephropathy
37 Plasma exchange is a logical approach, but shows no clinical benefit. A 3.5 L plasma exchange removes 65% of intravascular FLCs but has very little impact on overall FLC levels because they are also present in similar concentrations in the extravascular compartment and tissue edema fluid On the whole, dialyzers are similarly ineffective.
38 New option for FLC removal Until now, there has been little success in attempts to use blood purification
39 Perhaps.
40 Theralite High Cut-off technology It is with a new technology for the efficient and direct removal of FLCs High Cut-off technology is uniquely successful in removing FLCs because its large pores do not restrict removal. Hutchison et al. Clin J Am Soc Nephrol 2009;4:
41 Prevention of renal failure in MM IVF hydration Discontinuation of nephrotoxic drugs (i.e. NSAIDs, etc.) Chemotherapy/steroids treatment of multiple myeloma to decrease the filtered light chain load
42
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